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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50d086f645cab6cb3787f18d758d402ebd936e7f194c412d80f40ae07ad407cf' 
  AND token = 'MVPpXUJixZbpP2MQqp8HtbcWqW4Dw4j8oft2Wuw729k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}